org.geotools.mbstyle.parse

Class MBObjectStops

Object

MBObjectStops

public class MBObjectStops
extends Object

This class provides the ability to find all the zoom levels within a MapBox Style and returns a reduced list of only the layers and properties containing Base and Stops values. This class is only used with "zoom" and "zoom-and-property" and excludes the use of "property".

Author:

David Vick (Boundless)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MBObjectStops.LayerStops Function stops representation.

Field Summary

Fields

Modifier and Type	Field and Description
List<MBLayer>	layersForStop
MBObjectStops.LayerStops	ls
List<double[]>	ranges
List<Double>	stops

Constructor Summary

Constructors

Constructor and Description
MBObjectStops(MBLayer layer) Data structure for pre-processing a MBLayer determining whether the layer contains zoom and zoom-and-property functions and if so, getting the distinct stops for each, building a list of MBLayers (one for each stop) and setting ranges that are used to set min/max scale denominators for each MBLayer.

Method Summary

Modifier and Type	Method and Description
double	getCurrentStop(MBLayer layer) Gets the current stop of the layer.
double[]	getRangeForStop(Double stop, List<double[]> ranges) Finds the distinct range for the current stop.
double	getStop(MBLayer layer)
static Double	zoomLevelToScaleDenominator(double zoomLevel) Take a web mercator zoom level, and return the equivalent scale denominator (at the equator).

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ls

public MBObjectStops.LayerStops ls

stops

public List<Double> stops

layersForStop

public List<MBLayer> layersForStop

ranges

public List<double[]> ranges

Constructor Detail

MBObjectStops

public MBObjectStops(MBLayer layer)

Data structure for pre-processing a MBLayer determining whether the layer contains zoom and zoom-and-property functions and if so, getting the distinct stops for each, building a list of MBLayers (one for each stop) and setting ranges that are used to set min/max scale denominators for each MBLayer.

Parameters:

layer - Layer being processed for stops

Method Detail

getCurrentStop

public double getCurrentStop(MBLayer layer)

Gets the current stop of the layer. This would be the bottom of the range i.e 0 for {0, 20}

Parameters:

layer - Layer being processed

Returns:

Current zoom-level stop

getRangeForStop

public double[] getRangeForStop(Double stop,
                                List<double[]> ranges)

Finds the distinct range for the current stop.

Parameters:

stop - Current stop

ranges - Available ranges

Returns:

distinct range for current stop

zoomLevelToScaleDenominator

public static Double zoomLevelToScaleDenominator(double zoomLevel)

Take a web mercator zoom level, and return the equivalent scale denominator (at the equator).

Converting to a scale denominator at the equator is consistent with the conversion elsewhere in GeoTools, e.g., in the GeoTools YSLD ZoomContextFinder.

Parameters:

zoomLevel - The zoom level

Returns:

The equivalent scale denominator (at the equator)

getStop

public double getStop(MBLayer layer)